May 26 — Karabakh ruler Ibrahim Khan solemnly swore allegiance to Russia.
September 15 — Russia declared the First War against Napoleon.
November 11 — Mortier’s corps suffered a brutal defeat by Kutuzov near Dürenstein, losing more than 6,000 men.
November 13 — Viennese butcher Johann Laner invents sausages.
December 1 — The Battle of Austerlitz. In the battle known as the “Battle of the Three Emperors,” Napoleon’s army (73,000 men) inflicted a heavy defeat on the combined Russian-Austrian army (86,000 men).